124 lines
4.9 KiB
Zig
124 lines
4.9 KiB
Zig
const std = @import("std");
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const sdl3 = @import("sdl3");
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const spv = @import("spv");
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const shader_source = @embedFile("shader.spv");
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const screen_width = 1250;
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const screen_height = 720;
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pub fn main() !void {
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{
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//var gpa: std.heap.DebugAllocator(.{}) = .init;
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//defer _ = gpa.deinit();
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defer sdl3.shutdown();
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const init_flags = sdl3.InitFlags{ .video = true, .events = true };
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try sdl3.init(init_flags);
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defer sdl3.quit(init_flags);
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const window = try sdl3.video.Window.init("Hello triangle", screen_width, screen_height, .{});
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defer window.deinit();
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const surface = try window.getSurface();
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const allocator = std.heap.smp_allocator;
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var module = try spv.Module.init(allocator, @ptrCast(@alignCast(shader_source)), .{});
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defer module.deinit(allocator);
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var runner_cache: std.ArrayList(Runner) = try .initCapacity(allocator, screen_height);
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defer {
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for (runner_cache.items) |*runner| {
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runner.rt.deinit(allocator);
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}
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runner_cache.deinit(allocator);
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}
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for (0..screen_height) |_| {
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(try runner_cache.addOne(allocator)).* = .{
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.allocator = allocator,
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.surface = surface,
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.rt = try spv.Runtime.init(allocator, &module),
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};
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}
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var thread_pool: std.Thread.Pool = undefined;
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try thread_pool.init(.{
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.allocator = allocator,
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});
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var quit = false;
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while (!quit) {
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try surface.clear(.{ .r = 0.0, .g = 0.0, .b = 0.0, .a = 0.0 });
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while (sdl3.events.poll()) |event|
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switch (event) {
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.quit => quit = true,
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.terminating => quit = true,
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else => {},
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};
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{
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try surface.lock();
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defer surface.unlock();
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const pixel_map: [*]u32 = @as([*]u32, @ptrCast(@alignCast((surface.getPixels() orelse return).ptr)));
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var timer = try std.time.Timer.start();
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defer {
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const ns = timer.lap();
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const ms = @as(f32, @floatFromInt(ns)) / std.time.ns_per_s;
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std.log.info("Took {d:.3}s - {d:.3}fps to render", .{ ms, 1.0 / ms });
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}
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var wait_group: std.Thread.WaitGroup = .{};
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for (0..screen_height) |y| {
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const runner = &runner_cache.items[y];
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thread_pool.spawnWg(&wait_group, Runner.run, .{ runner, y, pixel_map });
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}
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thread_pool.waitAndWork(&wait_group);
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}
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try window.updateSurface();
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}
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}
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std.log.info("Successfully executed", .{});
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}
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const Runner = struct {
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const Self = @This();
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allocator: std.mem.Allocator,
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surface: sdl3.surface.Surface,
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rt: spv.Runtime,
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fn run(self: *Self, y: usize, pixel_map: [*]u32) void {
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const entry = self.rt.getEntryPointByName("main") catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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const color = self.rt.getResultByName("color") catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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const time = self.rt.getResultByName("time") catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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const pos = self.rt.getResultByName("pos") catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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const res = self.rt.getResultByName("res") catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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var output: [4]f32 = undefined;
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var rt = self.rt; // Copy to avoid pointer access of `self` at runtime. Okay as Runtime contains only pointers and trivially copyable fields
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for (0..screen_width) |x| {
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rt.writeInput(f32, &.{@as(f32, @floatFromInt(std.time.milliTimestamp()))}, time) catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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rt.writeInput(f32, &.{ @floatFromInt(screen_width), @floatFromInt(screen_height) }, res) catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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rt.writeInput(f32, &.{ @floatFromInt(x), @floatFromInt(y) }, pos) catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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rt.callEntryPoint(self.allocator, entry) catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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rt.readOutput(f32, output[0..], color) catch |err| std.debug.panic("Catch error {s}", .{@errorName(err)});
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const rgba = self.surface.mapRgba(
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@truncate(@as(u32, @intFromFloat(output[0] * 255.0))),
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@truncate(@as(u32, @intFromFloat(output[1] * 255.0))),
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@truncate(@as(u32, @intFromFloat(output[2] * 255.0))),
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@truncate(@as(u32, @intFromFloat(output[3] * 255.0))),
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);
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pixel_map[(y * self.surface.getWidth()) + x] = rgba.value;
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}
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}
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};
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